Apparatus comprising an inlet region for receiving a gas mixture; an ionizer for supplying hydronium ions to the received gas mixture to generate ions, wherein the ionizer comprises a membrane for receiving the gas mixture, and wherein the membrane, preferably made of graphene oxide, is capable of generating hydronium ions from water; and an ion detector for detecting ions generated from the gas mixture.
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October 15, 2015
April 14, 2020
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